Fire resistant ventilation duct and a method of manufacturing and installing such ventilation duct

Patent metadata

Field	Value
Publication number	US-12247689-B2
Application number	US-202017783751-A
Country	US
Kind code	B2
Filing date	Dec 11, 2020
Priority date	Dec 12, 2019
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

A ventilation duct for a fire rated ventilation duct wall penetration has one or more metal sheets forming said duct, wherein said metal sheet duct is covered on the outside by a heat insulating material, and said duct includes elongated stiffening members located on the outside of the duct and attached to said metal sheets. The stiffening members each comprises a metal profile and at least one non-combustible bar of inorganic material. The metal profile is fixed to the metal sheet of the duct and retains the non-combustible bar by at least partly encircling the bar.

First claim

The invention claimed is:

1. A ventilation duct for a fire rated ventilation duct wall penetration, said ventilation duct comprising:
one or more metal sheets forming said duct, wherein said metal sheet duct is covered on an outside by a heat insulating material, and said duct includes elongated stiffening members located on the outside of the duct and attached to said metal sheets;
wherein the stiffening members each comprise a metal profile and at least one non-combustible bar of inorganic material; and
wherein the metal profile is fixed to the metal sheet of the duct and retains the at least one non-combustible bar by at least partly encircling the bar.

2. A ventilation duct according to claim 1 , wherein the stiffening members extend transversely to a longitudinal extension of the duct.

3. A ventilation duct according to claim 1 , wherein the metal profile is U-shaped with exterior mounting flanges so that a longitudinal groove is provided which is configured to tightly receive the at least one non-combustible bar.

4. A ventilation duct according to claim 1 , wherein the at least one non-combustible bar is glued to the metal profile.

5. A ventilation duct according to claim 1 , wherein the metal profile is a steel profile.

6. A ventilation duct according to claim 1 , wherein the at least one non-combustible bar is based on gypsum, calcium silicate or cement.

7. A ventilation duct according to claim 6 , wherein the at least one non-combustible bar does not comprise a heat insulation material.

8. A ventilation duct according to claim 1 , wherein the stiffening members are fastened to the metal sheet duct by a plurality of rivets and/or screws.

9. A ventilation duct according to claim 1 , wherein the heat insulating material is also arranged on an outside of the stiffening members.

10. A ventilation duct according to claim 1 , wherein the heat insulating material is mineral wool.

11. A ventilation duct according to claim 10 , wherein the mineral wool is stone wool.

12. A ventilation duct according to claim 1 , wherein the duct has a square or rectangular cross-section.

13. A ventilation duct according to claim 1 , wherein the stiffening members comprise two or more stiffening members.

14. A ventilation duct according to claim 13 , wherein the two or more stiffening members are located along longer sides of the rectangular duct.

15. A ventilation duct according to claim 13 , wherein the two or more stiffening members comprise four stiffening members.

16. A ventilation duct according to claim 1 , wherein the stiffening members are located along a longer side of the rectangular duct.

17. A ventilation duct according to claim 1 , wherein one of the stiffening members is located on each side of the wall penetration.

18. A ventilation duct according to claim 17 , wherein the duct is essentially vertically oriented, and the stiffening members are located on an upper side of the wall penetration.

19. A ventilation duct according to claim 17 , wherein the duct is essentially vertically oriented, and the stiffening members are located on an upper side of a deck or floor.

20. A ventilation duct according to claim 1 , wherein the at least one non-combustible bar comprises two non-combustible bars, the metal profile being U-shaped with exterior mounting flanges so that a longitudinal groove is provided which is configured to tightly receive the two non-combustible bars.

21. A method of manufacturing and installing a ventilation duct in a fire rated ventilation duct wall penetration, said method comprising the steps of:
providing a ventilation duct section comprising one or more metal sheets forming said duct section;
mounting elongated stiffening members located on an outside of the duct section and attached to said metal sheets, wherein the stiffening members each comprises a metal profile and at least one non-combustible bar of inorganic material, wherein the profile is fixed to the metal sheet of the duct section and retains the at least one non-combustible bar by at least partly encircling the bar; and
positioning the ventilation duct section with stiffening members through an opening in a building structure;
covering said metal sheet duct section and the stiffening members with the non-combustible bars by a heat insulating material; and
sealing a gap between an outer surface of the insulation material and the opening in the building structure.

22. A method according to claim 21 , wherein the stiffening members extend transversely to a longitudinal extension of the ventilation duct.

23. A method according to claim 21 , wherein the metal profile is U-shaped with exterior mounting flanges so that a longitudinal groove is provided which is configured to tightly receive the at least one non-combustible bar.

24. A method according to claim 21 , wherein the at least one non-combustible bar is glued to the metal profile.

25. A method according to claim 21 , wherein the stiffening members are fastened to the metal sheet duct by a plurality of rivets and/or screws.

26. A method according to claim 21 , wherein the heat insulating material is also arranged on an outside of the stiffening members.

27. A method according to claim 21 , wherein the heat insulating material is mineral wool.

28. A method according to claim 27 , wherein the mineral wool is stone wool.

29. A method according to claim 21 , wherein the building structure is a separating building structure, and the wall penetration is through the separating building structure, the separating building structure being either vertical or horizontal in orientation.

30. A method according to claim 21 , wherein the gap between the outer surface of the insulation material and the opening in the building structure is sealed with an intumescent which is capable of swelling when exposed to heat.

31. A method according to claim 21 , wherein the at least one non-combustible bar comprises two non-combustible bars, the metal profile being U-shaped with exterior mounting flanges so that a longitudinal groove is provided which is configured to tightly receive the two non-combustible bars.

Assignees

• Rockwool As

Inventors

• Pedersen Kurt Munk
• Rödenberger Jürg Dieter Stefan
• Thoma Markus

Classifications

• F24F2221/30

  comprising fireproof material · CPC title

• F24F13/0263

  Insulation for air ducts · CPC title

• F24F13/0245

  Manufacturing or assembly of air ducts; Methods therefor · CPC title

• F16L59/145

  providing fire-resistance · CPC title

• F16L59/143

  Pre-insulated pipes · CPC title